SUBSPACE

subspace

(noun) a space that is contained within another space

Source: WordNet® 3.1

Etymology 1

Noun

subspace (countable and uncountable, plural subspaces)

(countable, mathematics) A subset of a space which is a space in its own right.

(uncountable, science fiction) Any (often unspecified) method of communicating faster than light speed.

Etymology 2

Noun

subspace (uncountable)

(BDSM) The psychological state of the submissive or "bottom" during sadomasochistic activity.

Coordinate terms

• topspace

Source: Wiktionary